Django-parler-rest

* Added support for [django-rest-framework](https://github.com/tomchristie/django-rest-framework) 3.
* Added `parler_rest.fields.TranslatedField` class to expose a single field in multiple languages (read only).
* Added `parler_rest.fields.TranslatedAbsoluteUrlField` class to expose a tranlated URL in a custom translations serializer.
* Support the `source` argument on the `TranslatedFieldsField`.
* Dropped support for [django-rest-framework](https://github.com/tomchristie/django-rest-framework) 2.

* Fix djangorestframework PiPI package name in `setup.py`.

* Initial release, extracted from [django-parler](https://github.com/django-parler/django-parler).